Air-heating apparatus



(No Model.)

A H. BAETZ. AIR HEATING APPARATUS.

N0. 604,013. Patented May 17,1898.

mi Nonms P21015 co, PHcTauTHO.; wAsHmuToN, D, c.

HENRY BAETZ, OF ST. LOUIS, MISSOURI.A

AIR-HEATING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 604,013, dated May 17, `1898. Application led June 26,1897. Serial No. 642,455. (No model.)

To all whom t may concern.-

Be it known that I, HENRY BAETZ, a citizen of the United States, residing at St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Air-Heating Apparatus, of which the'following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part thereof.

My invention has relation to improvements in air-heating apparatus; and it consistsin the novel arrangement and combination of parts more fully set forth in the specification and point-ed out in the claims.

In the drawings, Figure 1 is a perspective View of the furnace, with part broken away Vto show the disposition of the steam-coils. Fig. 2 is a top plan view of the coils, and Fig. 3 is an end elevation of the upper portion of the coils.

The object of my invention is to construct a steam-heated air-heating apparatus which, while it is compact, shall at the same time present a maximum `amount of heating-surface to the 'incoming currents `of air driven against such surface.

A further object is toso locate the air-fans relatively to the steam-pipes traversing the furnace as to produce a better disposition of the air-currents about the heated surfaces presented by the pipes.

A further object is to produce a furnace which shall be cheap to construct and one which can be readily taken apart for purposes of repairs.

In detail the invention may be described as follows:

Referring to the drawings, l represents a casing rectangular in cross-section, the main steam-pipes 2 3 being disposed along the upper portions of the inner surface of two adjacent walls, the said pipes communicating with a common coupling 4, with which the steam-supply pipe (not shown) directly coinmunicates. Screwed directly into the peripheral wall of the pipe 2 are a series of pipesections 5, provided with right and left hand screw-threaded ends, one end being adapted to screw into the wall of the pipe 2 and the opposite or farther end to simultaneously screw into or couple with one end of a large U-shaped coupling 6, whose opposite end is secured to onejend of a pipe-section '7, leading back toward the wall along which the pipe 42 is disposed and coupling with one end of a smaller U -shaped coupling 8, from whose opposite end a second pipe-section 5, parallel to the first section 5, extends. This arrangement is repeated along the length of the pipe 2, so 'that there extends downwardly in vertical planes a series of `resulting coils, each having a series of large U-shaped couplings atone end disposed adjacent to the inner surface of one wall of the furnace and a series of smaller U -shaped couplings at the opposite end and along the opposite wall of the furnace-casing, the last return-pipe section coupling to a drain-pipe 20, located at a suitable point below the` pipe 2 and disposed along the same wall of the casing. The pipe 2O is provided with a series of L-shaped nipples 9. the pipe 3, the arrangement, however, being reversed to that just described-that is, the

. nipples 9 are carried by the pipe 3,from which the coils 'extend downward-when the last pipe-section of the coil is screwed directly Asimilar series of coils extends from into the drain-pipe 21, disposed along the same wall with the pipe, the pipes 20 and 2l having a common exit 10. The two series of coil systems thus formed intersect each `other at right angles, each pair of pipe-sections coupled to the smaller `U-shaped coupling being adapted to be inserted into the space formed between any pair coupled to the ends of the, large U -shaped coupling, and by simply unscrewing, for'example, the pipesection 5 connecting the pipe 2 with its U- shaped coupling at the farther end and detaching the last pipe-section 7 from the nipple disposed along the upper peripheral surface of the lower drain-pipe 2O it is apparent that any one of the series of vertical coils of which the sections 5, &c., 7, dac., form a part can be withdrawn from the intersecting series (after removal, of course, of the wall of the furnace-casing) whenever such removal is necessary for purposes of repairs.

By the present arrangement there is formed a network of coils, ditdding the air driven in from underneath into many currents, each serving to abstract the heat from the maximum amount of heating-surface thus presented. The coils may be supported in any IOO suitable manner within the furnace-casing. The airis drawn in through openings in two opposite walls of the casing below the pipes by fans of any approved construction, the hot air being delivered from the exit-opening 12, as seen by the arrows.

Having described my invention, what I claim is- 1. In an air-heating apparatus, a suitable casing, steam-pipes disposed along the inner surfaces of two adjacent or contiguous vertical walls thereof, drain-pipes located below the steam-pipes and disposed along the same contiguous surfaces or walls of the casing, a series of coils leading from each steam-pipe tovits corresponding drain-pipe or that disposed along the same wall, the one series'intersecting the other at substantially the angle which the contiguous walls make with each other, and a fan located belowthe coils and carried by the wall of `the casing, substantially as set forth.

2. In Ian air-heating apparatus, a suitable casing, steam-pipes disposed along theinner surface of two adjacent walls thereof, a coupling at the meeting ends of the pipes for connection with a suitable steam-supply pipe, a series of pipe-sections secu-red directlyfto the peripheral wall of one of thepipes and leading to the opposite wall of the casing, alarge U -shaped coupling at the farther end of each of said pipe-sections, a return-pipe section leading back to 4the wall along which vthe mainpipe is disposed, a small U -shaped coupling at the adjacent end of saidreturn-pipe, a second pipe-section leading back to the opposite wall, and so on inl repetition of the first arrangement wherebyv a series of coils Vdisposed in vertical planes is formed, the last pipe of each member of the series terminating in a nipple disposed along the upperperipheral surface of a common drain-pipe disposed along the wall of the rst or main pipe, a secondvseries of coils intersecting .the rst series, said second series being similar to the first but reversely disposed thereto, that is to say, the adjacent steam and drain pipes having the arrangement and disposition of nipple connections and U-shaped couplings reversed, whereby the large U -shaped couplings of one series are disposed along a wall adjacent to that in which the large couplings of the other series are disposed, the pipe-sections coupled with the smaller U -shaped couplings occupying the space formed between the pipes connected lby the large U-shaped couplings of the second series, the drain-pipes of the two series being connected to a common exit, and a suitable fan adapted to drive .the air beneath the coils through openings formed in the opposite wallsv of the casing, substantially as set forth.

3. In an air-heating apparatus, a suitable casing, steam-pipes disposed along the inner surfaces of two adjacent or contiguous vertical walls thereof, drain-pipes located below the steam-pipes and disposed along the Ysame contiguous surfaces orwalls of the casing, and a series of coils leading from each steampipe to its corresponding. drain-pipe or that disposed along the same wall, the one series intersecting the .other at substantially the angle which the contiguousiwalls make `with each other, thewalls of the casing being provided withsuitable openings for the admission of air to the system of pipes, substantially as set forth. l

In testimony whereof I affix my signature Ain presence of two witnesses.

HENRY BAETZ.

Witnesses:

EMIL STAREK, ALFRED A. MATHEY. 

